John Deere CD4039DF008 - Manual (Page 60)

Maintenance/2000 hours/2 years
DPSG,CD03523,40 –19–13JUL99–1/1
CHECKING CRANKSHAFT VIBRATION
DAMPER (6-CYLINDER ENGINE ONLY)
RG8018
–
UN–15JAN99
RG7508
–UN–23NOV97
1. Remove belts (shown removed).
2. Grasp vibration damper with both hands and attempt to
turn it in both directions. If rotation is felt, damper is
defective and should be replaced.
IMPORTANT: The vibration damper assembly is not
repairable and should be replaced every
4500 hours or 5 years, whichever
occurs first.
3. Check vibration damper radial runout by positioning a
dial indicator so probe contacts damper outer
circumference.
4. With engine at operating temperature, rotate crankshaft
using JDG820 or JDE83 Flywheel Turning Tool.
5. Note dial indicator reading. If runout exceeds
specifications given below, replace vibration damper.
Damper—Specification
Maximum radial runout 1.50 mm (0.060 in.) ...............................................
40-4
112699
PN=60